humming noise in laptop adaptor

Discussion in 'General Electronics Chat' started by vks_foe, May 14, 2012.

  1. vks_foe

    Thread Starter Active Member

    Jan 11, 2009
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    5
    when i connect my laptop adapter to supply taken from inverter, it gives out humming noise and heats up more. Is it because of harmonics?
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    488
    Then surely your inverter doesn't provide a sinewave at it's output, rather a triangle or stepwave (or even square wave). So yes, harmonics.

    I managed to destroy the power supply of my oscilloscope while experimenting with a 5kW AC/DC converter on the same grid.
     
  3. vks_foe

    Thread Starter Active Member

    Jan 11, 2009
    55
    5
    where do we get the harmonics related specs of the devices... i mean the harmonics it can tolerate... on the adapters, only the power frequency, voltage and current ratings are mentioned..
     
  4. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    for laptop power adapters? you don't. there would be to much to specify.
     
  5. sheldons

    Active Member

    Oct 26, 2011
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    101
    the answer is dont power it via your invertor.....if the powersupply fails you could have very expensive laptop failure depending on how the supply fails.......
     
  6. vks_foe

    Thread Starter Active Member

    Jan 11, 2009
    55
    5

    isn't it better to design a filter for it ??
     
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